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Effects of Taurine on Myocardial cGMP/cAMP Ratio, Antioxidant Ability, and Ultrastructure in Cardiac Hypertrophy Rats Induced by Isoproterenol

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Taurine 8

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 776))

Abstract

Taurine is the most abundant free amino acid in the human body and accounts for more than 50% of the total amino acid pool in the mammalian heart. To investigate the preventive effects of taurine on cardiac hypertrophy in rats, myocardial injury was established by hypodermic injection of isoprenaline (ISO) (10 mg/kg d) for 7 days. The preventive effects of taurine (100 mg/kg d, 200 mg/kg d, and 300 mg/kg d, i.p) on heart coefficient; ultrastructure of cardiac muscle; the levels of creatine kinase heart isoenzyme (CK-MB), cAMP, and cGMP; and antioxidant ability were investigated. The results showed that taurine could significantly prevent the increase of heart coefficient induced by ISO. Compared with the model group, 100 mg/kg and 200 mg/kg taurine significantly decrease the levels of cAMP and cGMP, while 300 mg/kg taurine could significantly decrease the levels of cAMP in myocardium, and all the three concentrations of taurine could significantly increase the ratio of cGMP/cAMP. The level of serum CK-MB was significantly increased by ISO; 200 mg/kg taurine could significantly decrease it, but 100 mg/kg and 300 mg/kg taurine had no significant effect. As for the antioxidant ability, ISO administration could significantly increase the myocardial level of MDA but had no significant effects on the myocardial levels of SOD, GSH, GSH-Px, and T-AOC. However, taurine administration could significantly decrease the myocardial level of MDA and increase the levels of GSH and T-AOC compared with the model group. The serum levels of SOD, GSH-Px, GSH, and T-AOC were significantly reduced by ISO administration, but the level of MDA showed no significant changes compared with the control group. Taurine administration could significantly increase the serum levels of SOD, GSH-Px, GSH, and T-AOC and decrease the level of MDA compared with the model group. All the results indicated that 200 mg/kg taurine had better effects. The ultrastructure of cardiomyocytes showed that taurine administration could significantly reverse the injury caused by ISO. In conclusion, the present study demonstrated that taurine could inhibit the injury induced by ISO by increasing myocardial negative inotropic effect and antioxidant ability, decreasing the hypertrophic response to isoproterenol and protecting the integrity of ­myocardial ultrastructure, decreasing myocardial leak of CK-MB.

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Abbreviations

ISO:

Isoprenaline

CK-MB:

Creatine kinase heart isoenzyme

cAMP:

Cyclic adenosine monophosphate

cGMP:

Cyclic guanosine monophosphate

MDA:

Malondialdehyde

SOD:

Superoxide dismutase

GSH:

Reduced glutathione

GSH-Px:

Glutathione peroxidase

T-AOC:

Total antioxidation capacity

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Acknowledgements

This study was supported by a grant from the Education Department of Liaoning Province, China.

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Authors and Affiliations

  1. College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, 110866, P.R. China

    Qunhui Yang, Jiancheng Yang, Gaofeng Wu, Ying Feng, Qiufeng Lv, Shumei Lin & Jianmin Hu

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  1. Qunhui Yang
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Correspondence to Jianmin Hu .

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Editors and Affiliations

  1. City University of New York, Center for Developmental Neuroscience, College of Staten Island, 2800 Victory Blvd, Staten Island, 10314, New York, USA

    Abdeslem El Idrissi

  2. City University of New York, Department of Biology, College of Staten Island, Victory Blvd 2800, Staten Island, 10314, New York, USA

    William J. L'Amoreaux

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Yang, Q. et al. (2013). Effects of Taurine on Myocardial cGMP/cAMP Ratio, Antioxidant Ability, and Ultrastructure in Cardiac Hypertrophy Rats Induced by Isoproterenol. In: El Idrissi, A., L'Amoreaux, W. (eds) Taurine 8. Advances in Experimental Medicine and Biology, vol 776. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6093-0_21

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